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<?php
$basePath = dirname(__FILE__);
$configFile = $basePath . '/../config/facebook.json';
$expiryFile = $basePath . '/fb-user-token-expiry';
if (!file_exists($expiryFile) || trim(file_get_contents($expiryFile)) == date('Y-m-d')) {
$config = json_decode(file_get_contents($configFile), TRUE);
$firstLink =
'https://graph.facebook.com/oauth/client_code?' .
http_build_query([
'access_token' => $config['user_token'],
'client_id' => $config['app_id'],
'client_secret' => $config['app_secret'],
'redirect_uri' => 'http://rss.emkael.info/facebook.php'
]);
$firstResponse = json_decode(file_get_contents($firstLink));
$secondLink =
'https://graph.facebook.com/oauth/access_token?' .
http_build_query([
'client_id' => $config['app_id'],
'code' => $firstResponse->code,
'redirect_uri' => 'http://rss.emkael.info/facebook.php'
]);
$secondResponse = json_decode(file_get_contents($secondLink));
$config['user_token'] = $secondResponse->access_token;
fwrite(STDERR, 'FB API token renewed, expires on: ' . date('Y-m-d H:i:s', strtotime('+' . $secondResponse->expires_in . ' seconds')) . PHP_EOL);
file_put_contents($configFile, json_encode($config));
file_put_contents($expiryFile, date('Y-m-d', strtotime('+' . ($secondResponse->expires_in - 1440) . ' seconds')));
}
?>
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